Low-noise millimetre-wave mixer diodes: results and evaluation of a test programme

The results of extensive measurements on metal-gallium arsenide Schottky-barrier diodes in a waveguide mixer are presented, with emphasis on cooled, low-noise operation. Aspects of diode design and manufacture are reviewed, particularly with a view to the better understanding of noise generation in the diode. It appears that previous current-transport and noise-generation models require modification.